One man was killed and three other people were wounded in shootings in Chicago since Monday evening, police said.

The fatal shooting occurred around 6:15 p.m. Monday in the 5500 block of West Potomac Avenue in the North Austin neighborhood, according to Officer Nicole Trainor, a Chicago police spokeswoman.

A 23-year-old man, identified as Joseph Smith of the 1500 block of North Luna Avenue, was shot in the back and left leg and taken to Loyola University Medical Center, where he was pronounced dead, according to police and the Cook County medical examiner's office. Police said earlier that the man was 19 years old.

Smith was pronounced dead at 7:12 p.m. According to autopsy results, Smith died from a gunshot wound to his back. His death was ruled a homicide, according to the medical examiner's office.

Around 6 p.m., someone opened fire from a white car and wounded a 17-year-old girl and a 21-year-old woman who were in another car in the 300 block of West 45th Street in the Fuller Park neighborhood, police said.

The girl was shot in the abdomen and the woman wounded in the left arm, Trainor said. They managed to get to St. Bernard Hospital and were transferred to Stroger Hospital, where their conditions were stabilized.

The shooting may have stemmed from social media, Trainor said, but she had no details.

The most recent shooting occurred around 12:50 a.m. when a 21-year-old man was critically wounded in the West Elsdon neighborhood on the Southwest Side, according to police.

The man was standing on the corner in the 5800 block of South Pulaski Road when he shouted gang slogans and threw a can at a vehicle, police said. The driver, a 28-year-old man, fired at the 21-year-old and fled, police said.

The man was shot in the head and taken to Advocate Christ Medical Center in critical condition, police said.

A cashier at a 7-Eleven on the southwest corner of 59th Street and Pulaski said the 21-year-old man had been inside the store five minutes before the shooting.

Police said the 28-year-old driver was pulled over shortly after the shooting in the 6300 block of South Whipple Street, less than 2 miles away. No charges had been filed early Tuesday.